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power supply and transformers

Discussion in 'Electronic Basics' started by [email protected], Feb 3, 2005.

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  1. Guest

    I am having difficulty defining a transformer and a power supply. What
    is the difference between a power supply and a transformer - technical
    and philosophical?
  2. tempus fugit

    tempus fugit Guest

    A transformer basically converts a higher voltage to a lower one, or vice
    versa. So, in a stereo receiver, say, The incoming voltage from the wall is
    120v (or higher depending on where you live). This is usually too high a
    voltage for the components inside, so a transformer is used to step down the
    voltage to something more manageable. Once it is at the proper level, the
    voltage is fed to the rest of the power supply, where it is converted to DC
    and regulated so that it maintains a constant DC level regardless of load.
    So a transformer is usually part of a power supply, but the power supply
    turns the AC voltage into DC voltage at the required levels for the circuit
    it is powering.
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